Impact-chamber grain mills like the Nutrimill, Wonder Mill, and Blendtec Kitchen Mill (formerly K-tec) are best for grinding fine grades of flour, but have less grinding range than burr grain mill models like the Family Grain Mill and Country Living Grain Mill.
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Historically mills were powered by hand (e.g., via a hand crank), working animal (e.g., horse mill), wind or water . Today they are usually powered by electricity . The grinding of solid materials occurs through mechanical forces that break up the structure by overcoming the interior bonding forces.